<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    




    <div id="app">
        <span>标题</span>
        <button @click="clickBtn">{{ count }}</button>
        </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@3.2.26/dist/vue.global.js"></script>
    <script>
        const app = Vue.createApp({
            data(){
                return  {
                    count: 1,
                }
            },
            methods: {
                clickBtn(){
                    this.count += 1
                }
            }
        })

        app.mount('#app')
    </script>
</body>
</html>